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Health Notes

Disclaimer:
This scientific independent research is provided by Aisle7 and is for informational use only. GNC provides this information as a service but does not endorse it. Likewise, Aisle7 does not recommend or endorse any specific products.

For an herb, supported by traditional use but minimal or no scientific evidence. For a supplement, little scientific support.

Our proprietary "Star-Rating" system was developed to help you easily understand the amount of scientific support behind each supplement in relation to a specific health condition. While there is no way to predict whether a vitamin, mineral, or herb will successfully treat or prevent associated health conditions, our unique ratings tell you how well these supplements are understood by the medical community, and whether studies have found them to be effective for other people.

For over a decade, our team has combed through thousands of research articles published in reputable journals. To help you make educated decisions, and to better understand controversial or confusing supplements, our medical experts have digested the science into these three easy-to-follow ratings. We hope this provides you with a helpful resource to make informed decisions towards your health and well-being.

This supplement has been used in connection with the following health conditions:

Dose: 1,200 to 1,500 mg dailySupplementing with calcium may reduce the risk of gestational hypertension.(more)

Preeclampsia

Dose: 1,200 to 1,500 mg dailyAn analysis of double-blind trials found calcium supplementation to be highly effective in preventing preeclampsia.(more)

Pregnancy and Postpartum Support

Dose: Obtain a total of 1,500 to 2,000 mg daily, including both supplement and food sourcesCalcium needs double during pregnancy. Supplementing with calcium may reduce the risk of preeclampsia and pre-term delivery and improve the bone strength of the fetus.(more)

Dose: 1,000 to 1,200 mg dailyCalcium appears to reduce the risk of mood swings, bloating, headaches, and other PMS symptoms.(more)

Pregnancy and Postpartum Support

Dose: Obtain a total of 1,500 to 2,000 mg daily, including both supplement and food sourcesCalcium needs double during pregnancy. Supplementing with calcium may reduce the risk of preeclampsia and pre-term delivery and improve the bone strength of the fetus.(more)

Dysmenorrhea

Dose: Refer to label instructionsMuscles that are calcium-deficient tend to be hyperactive and therefore might be more likely to cramp. Calcium may help prevent menstrual cramps by maintaining normal muscle tone.(more)

Dose: Refer to label instructionsDespite the lack of evidence that calcium and vitamin D supplements alone are helpful to amenorrheic women, they are still generally recommended to prevent the added burden of calcium and vitamin D deficiency from further contributing to bone loss.(more)

Dose: 500 to 1,200 mg daily depending on age and other calcium sourcesAs lactose-containing foods are among the best dietary sources of calcium, lactose-intolerant people may want to use calcium supplements as an alternative source.(more)

Celiac Disease

Dose: Consult a qualified healthcare practitionerThe malabsorption that occurs in celiac disease can lead to multiple nutritional deficiencies. Supplementing with calcium may correct a deficiency.(more)

Dose: 1,000 to 1,200 mg dailyCalcium appears to reduce the risk of mood swings, bloating, headaches, and other PMS symptoms.(more)

Dysmenorrhea

Dose: Refer to label instructionsMuscles that are calcium-deficient tend to be hyperactive and therefore might be more likely to cramp. Calcium may help prevent menstrual cramps by maintaining normal muscle tone.(more)

Amenorrhea and Osteoporosis

Dose: Refer to label instructionsDespite the lack of evidence that calcium and vitamin D supplements alone are helpful to amenorrheic women, they are still generally recommended to prevent the added burden of calcium and vitamin D deficiency from further contributing to bone loss.(more)

Dose: 800 to 1,500 mg daily depending on age and dietary calcium intake
Calcium supplements help prevent osteoporosis, especially for girls and premenopausal women. It is often recommended to help people already diagnosed with osteoporosis.(more)

Dose: 1,000 to 1,500 mg per day (plus the same amount of calcium)
In preliminary research, people with chronic tension-type headaches who were also suffering from severe vitamin D deficiency experienced an improvement in their symptoms after supplementing with vitamin D and calcium.
(more)

Migraine Headache

Dose: Refer to label instructionsTaking large amounts of the combination of calcium and vitamin D has been reported to produce a marked reduction in the incidence of migraines in several women.(more)

Dose: Refer to label instructionsSome doctors recommend calcium to people with gum diseases. Calcium given to people with periodontal disease has been shown to reduce bleeding of the gums and loose teeth.(more)

Calcium deficiency has been implicated as a possible cause of GH.1, 2 In two preliminary studies, women who developed GH were found to have significantly lower dietary calcium intake than did pregnant women with normal blood pressure.3, 4 Calcium supplementation has significantly reduced the incidence of GH in preliminary studies5 and in many,6, 7, 8, 9, 10, 11 though not all,12 double-blind trials. Calcium supplements may be most effective in preventing GH in women who have low dietary intake of calcium. The National Institutes of Health (NIH) recommends an intake of 1,200 to 1,500 mg of calcium daily during normal pregnancy.13 In women at risk of GH, studies showing reduced incidence have typically used 2,000 mg of supplemental calcium per day,14, 15, 16, 17, 18, 19 without any reported maternal or fetal side effects.20, 21 Nonetheless, many doctors continue to suggest amounts no higher than 1,500 mg per day.

Calcium deficiency has been associated with preeclampsia.1 In numerous controlled trials, oral calcium supplementation has been studied as a possible preventive measure.2345 While most trials have found a significant reduction in the incidence of preeclampsia with calcium supplementation,67891011 One study reported that calcium supplementation reduced both the severity of preeclampsia and the mortality rate in the infants.12

An analysis of double-blind trials46 found calcium supplementation to be highly effective in preventing preeclampsia. However, a large and well-designed double-blind trial and a critical analysis of six double-blind trials concluded that calcium supplementation did not reduce the risk of preeclampsia in healthy women at low risk for preeclampsia.13 For healthy, high-risk (in other words, calcium deficient) women, however, the data show a clear and statistically significant beneficial effect of calcium supplementation in reducing the risk of preeclampsia.1415161718192021222324252627

The National Institutes of Health recommends an intake of 1,200 to 1,500 mg of elemental calcium daily during normal pregnancy.28 In women at risk of preeclampsia, most trials showing reduced incidence have used 2,000 mg of supplemental calcium per day.29 Nonetheless, many doctors continue to suggest amounts no higher than 1,500 mg per day.

Dose: Obtain a total of 1,500 to 2,000 mg daily, including both supplement and food sources

Calcium needs double during pregnancy.1 Low dietary intake of this mineral is associated with increased risk of preeclampsia, a potentially dangerous (but preventable) condition characterized by high blood pressure and swelling. Supplementation with calcium may reduce the risk of pre-term delivery, which is often associated with preeclampsia. Calcium may reduce the risk of pregnancy-induced hypertension,2 though these effects are more likely to occur in women who are calcium deficient.3, 4 Supplementation with up to 2 grams of calcium per day by pregnant women with low dietary calcium intake has been shown to improve the bone strength of the fetuses.5

Women who consume more calcium from their diets are less likely to suffer severe PMS.1 A large double-blind trial found that women who took 1,200 mg per day of calcium for three menstrual cycles had a 48% reduction in PMS symptoms, compared to a 30% reduction in the placebo group.2 Other double-blind trials have shown that supplementing 1,000 mg of calcium per day relieves premenstrual symptoms.3, 4

Dose: Obtain a total of 1,500 to 2,000 mg daily, including both supplement and food sources

Calcium needs double during pregnancy.1 Low dietary intake of this mineral is associated with increased risk of preeclampsia, a potentially dangerous (but preventable) condition characterized by high blood pressure and swelling. Supplementation with calcium may reduce the risk of pre-term delivery, which is often associated with preeclampsia. Calcium may reduce the risk of pregnancy-induced hypertension,2 though these effects are more likely to occur in women who are calcium deficient.3, 4 Supplementation with up to 2 grams of calcium per day by pregnant women with low dietary calcium intake has been shown to improve the bone strength of the fetuses.5

In theory, calcium may help prevent menstrual cramps by maintaining normal muscle tone. Muscles that are calcium-deficient tend to be hyperactive and therefore might be more likely to cramp. Calcium supplementation was reported to reduce pain during menses in one double-blind trial,1 though another such study found that it relieved only premenstrual cramping, not pain during menses.2 Some doctors recommend calcium supplementation for dysmenorrhea, suggesting 1,000 mg per day throughout the month and 250-500 mg every four hours for pain relief, during acute cramping (up to a maximum of 2,000 mg per day).

A preliminary trial showed that bone loss occurred over a one-year period in amenorrheic exercising women despite daily supplementation with 1,200 mg of calcium and 400 IU of vitamin D.1 In a controlled study of amenorrheic nursing women, who ordinarily experience brief bone loss that reverses when menstruation returns, bone loss was not prevented by a multivitamin supplement providing 400 IU of vitamin D along with 500 mg twice daily of calcium or placebo.2 Despite the lack of evidence that calcium and vitamin D supplements alone are helpful to amenorrheic women, they are still generally recommended to prevent the added burden of calcium and vitamin D deficiency from further contributing to bone loss.3 Amounts typically recommended are 1,200 to 1,500 mg calcium and 400 to 800 IU vitamin D daily.

Caution: Calcium supplements should be avoided by prostate cancer patients.

Some preliminary1 and double-blind2, 3 trials have shown that supplemental calcium reduces cholesterol levels. Possibly the calcium is binding with and preventing the absorption of dietary fat.4 However, other research has found no substantial or statistically significant effects of calcium supplementation on total cholesterol or HDL ("good") cholesterol.5 Reasonable supplemental levels are 800 to 1,000 mg per day.

Caution: Calcium supplements should be avoided by prostate cancer patients.

In a preliminary trial, supplementation with 800 mg of calcium per day for one year resulted in a statistically significant 35% reduction in the average TG level among people with elevated cholesterol and triglycerides.1 However, in another trial, calcium supplementation had no effect on TG levels.2 One of the differences between these two trials was that more people in the former trial had initially elevated TG levels.

Caution: Calcium supplements should be avoided by prostate cancer patients.

Calcium supplementation-typically 800-1,500 mg per day-may lower blood pressure. However, while an analysis of 42 trials reported that calcium supplementation led to an average drop in blood pressure that was statistically significant, the actual decrease was small (in medical terms, a drop of 1.4 systolic over 0.8 diastolic pressure).1 Results might have been improved had the analysis been limited to studies of people with hypertension, since calcium has almost no effect on the blood pressure of healthy people. In the analysis of 42 trials, effects were seen both with dietary calcium and with use of calcium supplements. A 12-week trial of 1,000 mg per day of calcium accompanied by blood pressure monitoring is a reasonable way to assess efficacy in a given person.

Dose: 500 to 1,200 mg daily depending on age and other calcium sources

Caution: Calcium supplements should be avoided by prostate cancer patients.

Researchers have yet to clearly determine whether lactose-intolerant people absorb less calcium.1 As lactose-containing foods are among the best dietary sources of calcium, alternative sources of calcium (from beverages, foods, or supplements) are important for lactose-intolerant people. A typical amount of supplemental calcium is 1,000 mg per day.

Caution: Calcium supplements should be avoided by prostate cancer patients.

The malabsorption that occurs in celiac disease can lead to multiple nutritional deficiencies. The most common nutritional problems in people with celiac disease include deficiencies of essential fatty acids, iron, vitamin D, vitamin K, calcium, magnesium, and folic acid.1Zinc malabsorption also occurs frequently in celiac disease2 and may result in zinc deficiency, even in people who are otherwise in remission.3 People with newly diagnosed celiac disease should be assessed for nutritional deficiencies by a doctor. Celiac patients who have not yet completely recovered should supplement with a high-potency multivitamin-mineral. Some patients may require even higher amounts of some of these vitamins and minerals-an issue that should be discussed with their healthcare practitioner. Evidence of a nutrient deficiency in a celiac patient is a clear indication for supplementation with that nutrient.

After commencement of a gluten-free diet, overall nutritional status gradually improves. However, deficiencies of some nutrients may persist, even in people who are strictly avoiding gluten. For example, magnesium deficiency was found in 8 of 23 adults with celiac disease who had been following a gluten-free diet and were symptom-free. When these adults were supplemented with magnesium for two years, their bone mineral density increased significantly.4

Women who consume more calcium from their diets are less likely to suffer severe PMS.1 A large double-blind trial found that women who took 1,200 mg per day of calcium for three menstrual cycles had a 48% reduction in PMS symptoms, compared to a 30% reduction in the placebo group.2 Other double-blind trials have shown that supplementing 1,000 mg of calcium per day relieves premenstrual symptoms.3, 4

In theory, calcium may help prevent menstrual cramps by maintaining normal muscle tone. Muscles that are calcium-deficient tend to be hyperactive and therefore might be more likely to cramp. Calcium supplementation was reported to reduce pain during menses in one double-blind trial,1 though another such study found that it relieved only premenstrual cramping, not pain during menses.2 Some doctors recommend calcium supplementation for dysmenorrhea, suggesting 1,000 mg per day throughout the month and 250-500 mg every four hours for pain relief, during acute cramping (up to a maximum of 2,000 mg per day).

A preliminary trial showed that bone loss occurred over a one-year period in amenorrheic exercising women despite daily supplementation with 1,200 mg of calcium and 400 IU of vitamin D.1 In a controlled study of amenorrheic nursing women, who ordinarily experience brief bone loss that reverses when menstruation returns, bone loss was not prevented by a multivitamin supplement providing 400 IU of vitamin D along with 500 mg twice daily of calcium or placebo.2 Despite the lack of evidence that calcium and vitamin D supplements alone are helpful to amenorrheic women, they are still generally recommended to prevent the added burden of calcium and vitamin D deficiency from further contributing to bone loss.3 Amounts typically recommended are 1,200 to 1,500 mg calcium and 400 to 800 IU vitamin D daily.

Dose: 800 to 1,500 mg daily depending on age and dietary calcium intake

Caution: Calcium supplements should be avoided by prostate cancer patients.

Although insufficient when used as the only intervention, calcium supplements help prevent osteoporosis.1 Though some of the research remains controversial, the protective effect of calcium on bone mass is one of very few health claims permitted on supplement labels by the U.S. Food and Drug Administration.

In some studies, higher calcium intake has not correlated with a reduced risk of osteoporosis-for example, in women shortly after becoming menopausal2 or in men.3 However, after about three years of menopause, calcium supplementation does appear to take on a protective effect for women.4 Even the most positive trials using isolated calcium supplementation show only minor effects on bone mass. Nonetheless, a review of the research shows that calcium supplementation plus hormone replacement therapy is much more effective than hormone replacement therapy without calcium.5 Double-blind research has found that increasing calcium intake results in greater bone mass in girls.6 An analysis of many trials investigating the effects of calcium supplementation in premenopausal women has also shown a significant positive effect.7 Most doctors recommend calcium supplementation as a way to partially reduce the risk of osteoporosis and to help people already diagnosed with the condition. In order to achieve the 1,500 mg per day calcium intake many researchers deem optimal, 800 to 1,000 mg of supplemental calcium are generally added to the 500 to 700 mg readily obtainable from the diet.

While phosphorus is essential for bone formation, most people do not require phosphorus supplementation, because the typical western diet provides ample or even excessive amounts of phosphorus. One study, however, has shown that taking calcium can interfere with the absorption of phosphorus, potentially leading to phosphorus deficiency in elderly people, whose diets may contain less phosphorus.8. The authors of this study recommend that, for elderly people, at least some of the supplemental calcium be taken in the form of tricalcium phosphate or some other phosphorus-containing preparation.

Dose: 1,000 to 1,500 mg per day (plus the same amount of calcium)
In a preliminary trial, eight patients had chronic tension-type headache in association with severe vitamin D deficiency. In each case, the headaches resolved after treatment with vitamin D3 (1,000 to 1,500 IU per day) and calcium (1,000 to 1,500 mg per day).1

Caution: Calcium supplements should be avoided by prostate cancer patients.

Taking large amounts of the combination of calcium (1,000 to 2,000 mg per day) and vitamin D has been reported to produce a marked reduction in the incidence of migraines in several women.1, 2 However, the amount of vitamin D given to these women (usually 50,000 IU once a week), can cause adverse reactions, particularly when used in combination with calcium. This amount of vitamin D should be used only under medical supervision. Doctors often recommend that people take 800 to 1,200 mg of calcium and 400 IU of vitamin D per day. However, it is not known whether theses amounts would have an effect on migraines.

Caution: Calcium supplements should be avoided by prostate cancer patients.

In a study of obese people consuming a low-calorie diet for 24 weeks, those receiving a calcium supplement (800 mg per day) lost significantly more weight than those given a placebo.1 Calcium was effective when provided either as a supplement, or in the form of dairy products. In a second study, however, the amount of weight loss resulting from calcium supplementation (1,000 mg per day) was small and not statistically significant.2 In that study, participants' typical diet contained more calcium than in the study in which calcium supplementation was more effective. Thus, it is possible that calcium supplementation enhances weight loss only when the diet is low in calcium.

Caution: Calcium supplements should be avoided by prostate cancer patients.

Some,1 but not all,2 research has found that giving 500 mg of calcium twice per day for six months to people with periodontal disease results in a reduction of symptoms (bleeding gums and loose teeth). Although some doctors recommend calcium supplementation to people with diseases of the gums, supportive scientific evidence remains weak.

Caution: Calcium supplements should be avoided by prostate cancer patients.

In the past, doctors have sometimes recommended that people with a history of kidney stones restrict calcium intake because a higher calcium intake increases the amount of calcium in urine. However, calcium (from supplements or food) binds to oxalate in the gut before either can be absorbed, thus interfering with the absorption of oxalate. When oxalate is not absorbed, it cannot be excreted in urine. The resulting decrease in urinary oxalate actually reduces the risk of stone formation,1 and the reduction in urinary oxalate appears to outweigh the increase in urinary calcium.2 In clinical studies, people who consumed more calcium in the diet were reported to have a lower risk of forming kidney stones than people who consume less calcium.3, 4, 5

However, while dietary calcium has been linked to reduction in the risk of forming stones, calcium supplements have been associated with an increased risk in a large study of American nurses.6 The researchers who conducted this trial speculate that the difference in effects between dietary and supplemental calcium resulted from differences in timing of calcium consumption. Dietary calcium is eaten with food, and so it can then block absorption of oxalates that may be present at the same meal. In the study of American nurses, however, most supplemental calcium was consumed apart from food.7 Calcium taken without food will increase urinary calcium, thus increasing the risk of forming stones; but calcium taken without food cannot reduce the absorption of oxalate from food consumed at a different time. For this reason, these researchers speculate that calcium supplements were linked to increased risk because they were taken between meals. Thus, calcium supplements may be beneficial for many stone formers, as dietary calcium appears to be, but only if taken with meals.

When doctors recommend calcium supplements to stone formers, they often suggest 800 mg per day in the form of calcium citrate or calcium citrate malate, taken with meals. Citrate helps reduce the risk of forming a stone (see "Dietary changes that may be helpful" above).8 Calcium citrate has been shown to increase urinary citrate in stone formers, which may act as protection against an increase in urinary calcium resulting from absorption of calcium from the supplement.9

Despite the fact that calcium supplementation taken with meals may be helpful for some, people with a history of kidney stone formation should not take calcium supplements without the supervision of a healthcare professional. Although the increase in urinary calcium caused by calcium supplements can be mild or even temporary,10 some stone formers show a potentially dangerous increase in urinary calcium following calcium supplementation; this may, in turn, increase the risk of stone formation.11 People who are "hyperabsorbers" of calcium should not take supplemental calcium until more is known. Using a protocol established years ago in the Journal of Urology, 24-hour urinary calcium studies conducted both with and without calcium supplementation determine which stone formers are calcium "hyperabsorbers."12 Any healthcare practitioner can order this simple test.

Calcium is the most abundant, essential mineral in the human body. Of the two
to three pounds of calcium contained in the average body, 99% is located in the
bones and teeth. Calcium is needed to form bones and teeth and is also required
for blood clotting, transmission of signals in nerve cells, and muscle
contraction. The importance of calcium for preventing osteoporosis is probably
its most well-known role.

The information presented in Aisle7 is for informational purposes only. It is based on scientific studies (human, animal, or in vitro), clinical experience, or traditional usage as cited in each article. The results reported may not necessarily occur in all individuals. For many of the conditions discussed, treatment with prescription or over the counter medication is also available. Consult your doctor, practitioner, and/or pharmacist for any health problem and before using any supplements or before making any changes in prescribed medications. Information expires June 2016.

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Description:
Liquid Calcium Magnesium Great Tasting Orange Flavor Facts
you should know about Calcium: Q: What does it mean when the label says "Elemental Calcium"? A: Elemental Calcium is a term used for pure calcium. However, pure calcium is not available ...